CVE-2026-6907
Potential exposure of private data due to incorrect handling of Vary: * in UpdateCacheMiddleware
- State
- Published
- Severity
- 2.3 Low
- Published
- May 5, 2026
- Updated
- May 6, 2026
- Reserved
- Apr 23, 2026
Description
An issue was discovered in 6.0 before 6.0.5 and 5.2 before 5.2.14. `django.middleware.cache.UpdateCacheMiddleware` erroneously caches requests where the `Vary` header contained an asterisk (`'*'`). This can lead to private data being stored and served. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Ahmad Sadeddin for reporting this issue.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 2.3 Low | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N | DSF |
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N | DSF |
Weaknesses
- CWE-524 Use of Cache Containing Sensitive Information
Affected Products
| Product | Versions |
|---|---|
Djangodjangoproject |
|
References
- Django security archivevendor-advisory
- Django releases announcementsmailing-list
- Django security releases issued: 6.0.5 and 5.2.14vendor-advisory
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